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(No Model.) 3 SheetsSheet 1. T. W. WORSDELL.

COMPOUND STEAM ENGINE.

Patented Apr. 5,1887.

N. PETERS. Phulo-Lithogrlpher, Wnhinglom D. C.

(No Model.) 3 Sheets-Sheet'.2.

. T. W. WORSDELL.

GOMPOUND STEAM ENGINE.

Patented Apr. 5

Nv PETERS. Photo-Lillwgmphun Wuhlngiar. D. C"

(No Model.) 3 Sheets-Sheet 3.

'1 .v W. WORSDELL.

COMPOUND STEAM ENGINE.

Patented Apr. 5, 1887.

ERS Photo-Hummer. Wnhillg'nn. D. Q

UNITED" STATES THOMAS \VILLIAM \VORSDELL, OF \VANSTEAD, COUNTY OF ESSEX, ENGLAND.

PATENT OFFICE.

COMPOUND STEAM-ENGINE.

, SPECIFICATION forming part of Letters Patent No. 360,834, dated April 5, 1887.

Application filed March 18, 1885. Serial No. 159,308. (No model.) Patented in England January .23, IP85, No. 999, and in France March 30, 1885. No. 167,961.

Britain and Ireland, residing at Wansteadfln} the county of Essex, Kingdom of Great Britain and Ireland, have invented new and useful Improvements in Compound Steam-Engines,

(which have been patented to me as follows: Great Britain, January 23, 1885, No. 999, and France, March 30, 1885, N 0. 167,961,) of which the following is a specification.

This invention has reference to compound steam-engines of the locomotive type,but may be applied in engines for other uses. A description of it as applied to an inside-cylinder locomotive-engine will enable the nature of the invention to be clearly understood. Two cylinders areemployedone for high pressure and the other for low pressureso arranged that they can be applied to the same cranks, rods, valvegears, reversing-motion, 850., as in an ordinary high-pressure engine, the pistons operating on one crank-axle in the usual way.

One of the cylinders (the high-pressure or smallerone) takes steam directfrom the boiler. When this steam is exhausted, it passes through a superheater pipe or chamber to the low pressure cylinder. After performing its function therein, the steam from the low-pressure or larger cylinder is exhausted direct up the chimney, or, where required,-can be passed through a feed-water heater, or wholly or partially condensed by being led into the watertank of the engine or tender.

To render the engine efficient in starting, if the crank onthe high-pressure side should be on a deadcenter, an auxiliary or starting valve is provided, by which steam can be conveyed direct from the boiler to the low-pressure or larger cylinder, and in order to prevent such steam filling the exhaust-steam pipe or chamber of the high-pressure cylinder, and

consequently,also,the high-pressure or smaller cylinder itself through the exhaust-ports, there is provided a valve that I will call the intercepting-valve. It is applied in the exhaust pi pc or passage that connects the two cylinders, and is arranged between the starting-valve and the high-pressure-exhaust orifice. (Conveniently, it may be just abovethe start1ng-valve.) When closed, this intercepting-valve will prethe expulsion of water.

.vent the steam getting back to'the high-pressing-valve may be arranged to be opened by hand against a spring, so as whenliberated to be closed in an automatic'manner.

The low-pressure cylinder is or may be fitted with a relief-valve at each end, to prevent the cylinder being charged at too higha pressure when steam is admitted direct from the boiler through thestarting-valve. Such valves will also become self-acting waste-cocks for My invention, as described, may be carried out under various arrange1nents,and is applicable to ordinary locomotive-engines, whether of the inside or outside cylinder type. As will be evident, an intercepting-valve, such as above described, is applicable to engines of various types wherein exhaust-steam passes from a high-pressure cylinder to do duty ina low-pressure cylinder and where a starting-valve is applied.

In the accompanying drawings, Figure 1 is a vertical section through the smoke-box of a locomotiveengine according to this invention; and Fig. 2, a detail view, in section, of the superheater-pipe.

The highpressure cylinder at receives its steam from the boiler in the usual manner, the distribution of the motive fluid being'effected by any suitable arrangement of valve and,

valve-gear. After the steam has performed its office in the cylinder, it is exhausted into the pipe b, which traverses the smoke;box and acts as a superheater. This pipe delivers the branch, 6, connected to the boiler, and serving for the admission of full-pressure steam to the large cylinder when required. This branch 6 is commanded by an auxiliary starting-valve,

f, which can be opened and closed from the foot-plate. Fig. 3 is a vertical section of this auxiliary starting-valve with a portion of the branch 0 attached thereto. Fig. 4 is an clevation at right angles to Fig. 3; and Fig. 5 is a section on-the line at" :t', Fig. 3,with the valve propcr,f,removcd. There is also arranged in the pipe b, between the inlet of the branch 0 and the high-pressure cylinder, an intercepting-valve, g, which is shown in section in the detail view, Fig. 2. This is shown in the drawings as a flap or foot valve mounted upon a spindle and operated by a lever which can be manipulated from the foot-plate, either simultaneously with theauxiliary starting-valve or independently of it. \Vhen the intercepting-valve is opeu,it allows a clear passage for the steam, the tendency of the pressure during the normal working being to hold the valve open. \Vhen it is closed, it prevents the highpressure steam, which is admitted to the large cylinder through the auxiliary valve, finding its way to the reverse side of the piston in the high-pressure cylinder, as already l'ully explained. A relief-valve, h, is fitted to each end of the large cylinder, to prevent thesteampressure exceeding a determined amount and to allow escape for any water that may be present therein.

Both cylinders work onto one crankshaft and have their valves operated in the usual way.

Although the drawings only show the invention applied to a locomotive, it is evident that with simple modifications it is equally applicable to other forms of compound steamengines.

\Vhat I claim in a compound steam-engine 1s- A steam-generator, a high and a low pressure cylinder, 21 steam-inlet pipe leading from said steam-generator to the high-pressure cylinder, a connecting-pipe leading from the exhaust of the high-pressure cylinder to the steam-chest of the low-pressure cylinder, a branch pipe leading from the steam-generator into the said connecting-pipe, and an auxiliary startingyalve, in combination with an autotnatic intercepting-valve located in said eonnecting-pipe between the point where said branch pipe enters the same and the highpressure cylinder, said intercepting-valve being of such a character that immediately exhausting takes placefromthehigh-prcssure cylinder the intercepting-valve is automatically opened and always remains open while steam is passing from the high to the low pressure cylinder, but can be closed before the auxiliary valve is opened,substantially as set forth.

THOMAS WILLIAM \VOltSlll'lhli.

\Vitnesses:

J OHN CHARLES TAITE,

63 Queen Victoria Street, London. EDWD. N. Hoses, 2 Popcs lIcad Alley, Corn/till, London, G cam. 

